# IBT ↔ FRAWLEY OVERLAP — does Frawley's de minimis dataset rest on Industrial Bio-Test's fraudulent studies?

*The experiment requested: cross-reference the **EPA "Summary of the IBT Review Program," Office of Pesticide
Programs (1983)** — the official roster of Industrial Bio-Test (IBT) studies EPA found invalid — against the
**220-compound chronic-toxicity tabulation** that anchors Frawley's de minimis / "toxicologically insignificant
levels" proposal (Frawley 1967, "Scientific Evidence and Common Sense…," FCT 5(3):293–308), and estimate which
of Frawley's compounds were **reliant on IBT**.* This resolves (and reframes) open-question **A6**.

**Grading:** **[CONFIRMED-primary]** = read in the two local primary PDFs · **[inference]** · **[unconfirmed]**.
Verified by a 4-agent adversarial pass (independent superscript re-read, chemistry-name checks, EPA-scope check,
skeptic). Sources, both local:
- `papers/Frawley - 1967 - Scientific evidence…pdf` → appendix pp. 303–308 (text `papers/f1967.txt`; appendix
  superscripts read from 400-dpi crops `papers/appx/`).
- `papers/Summary of the IBT Review Program- Office of Pesticides Program 1983.PDF` (46 pp., image-only;
  OCR'd here → `papers/ibt_review_1983_ocr.txt`).

---

## TL;DR (read this first — it is NOT an exoneration)
1. **Explicit IBT reliance in Frawley's published dataset is small and atypical: exactly 4 of 220 compounds**
   cite IBT (ref 26) as their data source — and **all 4 are D&C colour additives** (D&C Orange 5, D&C Orange 10,
   D&C Red 21, D&C Red 27), not pesticides. **[CONFIRMED-primary]**
2. **The EPA 1983 review is pesticides-only** (140 pesticides / 801 studies; **74% found invalid**). Frawley's 4
   IBT dyes therefore cannot appear in it — they belong to a different regulatory universe (FDA colour additives,
   not EPA pesticides). So "zero study-level overlap" is **tautological, not reassuring.** **[CONFIRMED-primary]**
3. **The pesticide cross-list is real but the laundering pathway is structurally FORECLOSED.** **14 of Frawley's
   pesticides appear by name in EPA's IBT review** (12 in the invalid-study roster); **for every one Frawley cited
   A.J. Lehman, not IBT.** The obvious objection — *a Lehman citation doesn't prove the data weren't IBT's, since
   compendia relay others' data* (raised independently by the user and the skeptic) — was investigated and
   **does not hold for these pesticides**: Lehman's *Summaries* were the **house output of the FDA Division of
   Pharmacology** (which Lehman ran 1946–55 and **where Frawley himself worked**), serialized **1948–1955, before
   IBT (founded 1953) did any pesticide testing**; the traceable no-effect values resolve to **FDA in-house studies,
   several authored by Frawley himself** (parathion/EPN = Frawley & Fuyat 1957; toxaphene = Fitzhugh & Nelson 1951;
   diazinon = Williams/Fuyat/Fitzhugh 1959); and **every IBT study on these compounds is dated 1967+** — after his
   1965 source and his own cutoff. **[established]** (full trace: `lehman-ibt-provenance` workflow; §4).
4. **The single fully-traced chain lands on Frawley's own employer:** EPA invalidated a **Hercules-sponsored
   toxaphene reproduction-rat study** (toxaphene = a Hercules flagship product; reproduction studies = Frawley's
   own genre, co-authored with IBT president J.C. Calandra). It is the most probative datapoint, not a curiosity.
   **[CONFIRMED-primary]**

---

## 1. Frawley's explicit IBT-sourced compounds (ref 26) — 4 of 220
The 1967 appendix attaches a numbered reference superscript to every compound. **Reference 26 = "Industrial
Bio-Test Laboratories (Unpublished data)"** — the only IBT reference in the paper. Exactly four compounds carry it
(independently re-read from the page crops; D&C Red 9/10 carry refs 27/28 and are *not* IBT):

| Frawley compound | No-effect level | Source ref | IBT? |
|---|---|---|---|
| **D & C Orange No. 5** | 10,000 ppm | 26 | ✅ IBT |
| **D & C Orange No. 10** | 10,000 ppm | 26 | ✅ IBT |
| **D & C Red No. 21** | 10,000 ppm | 26 | ✅ IBT |
| **D & C Red No. 27** | 10,000 ppm | 26 | ✅ IBT |

*Other "unpublished industry data" in the same appendix (relevant to the broader conflict-of-interest picture but
NOT IBT):* **ref 3 = Hercules Inc. (unpublished)** → Alkyl ketene dimer, **Herban** (=norea, a Hercules herbicide),
Polymerized turpentine resin; **ref 29** = American Cyanamid → Dicyandiamide; **ref 54** = DuPont/Haskell → Nylon
(Zytel); **ref 70** = FDA → Sodium chromate. The other ~10 dyes Frawley tabulated (Citrus Red 2, D&C Red 9 & 10,
FD&C Blue 1/2, Fast/Light Green, Ponceau 3R/SX, Tartrazine, Yellow AB/OB) cite FDA/independent authors — an
**IBT-free** subset. **[CONFIRMED-primary]**

## 2. The EPA 1983 IBT review — scope & scale
EPA's Office of **Pesticide** Programs re-examined IBT's health-effects studies submitted for pesticide
registration. **Scope = pesticides only** (the intro reviews "health effects studies on pesticides tested by
IBT"; Exhibit B "covers **801 studies on 140 pesticides**"). Summary statistics: **131 (16%) valid · 594 (74%)
invalid** (the document's own count, p.1: "594 (74%) have been found invalid"; the remaining ~10% are
partially valid / supplemental). The detailed roster lists each invalid study as `[study#] CHEMICAL  SPONSOR  STUDY-TYPE  SPECIES  I/V …
replacement-status`. **No colour/cosmetic additive appears anywhere** in the document (exhaustive grep:
"orange" 0 hits; no "D&C", "FD&C", "dye", "colour"). **[CONFIRMED-primary]**

## 3. The overlap matrix

### 3a. Direct study-level overlap (Frawley's IBT entries ∩ EPA invalid roster) = **0 — but structurally guaranteed**
Frawley's 4 IBT-sourced studies are **colour additives**; the EPA audit is **pesticides**. The two datasets
**cannot** intersect by construction (FDA vs EPA jurisdiction). The zero is an artifact of disjoint regulatory
universes, **not** evidence that the four dye studies were sound. **[CONFIRMED-primary]**

### 3b. Chemical-name cross-list (Frawley's *pesticides* ∩ EPA's IBT review) = **14**
Same active ingredient in both lists — **but Frawley's cited source is Lehman/Hercules, never IBT:**

| Frawley pesticide (his ref) | = identity | In EPA IBT review | Evidence (OCR line) |
|---|---|---|---|
| Captan (4) | captan | invalid roster | `B-2804 CAPTAN … REPRODUCTION RAT I` (l.880) |
| 1-Naphthyl-N-methylcarbamate (1) | **Carbaryl**/Sevin | roster | `…CARBARYL MONSANTO CHOLINESTERASE RAT` (l.893) |
| Diazinon (4) | diazinon | roster | `B-4321 DIAZINON CIBA GEIGY … I` (l.997) |
| Co-Ral (4) | **coumaphos** | roster | `…CORAL CHEMAGRO … I REPLACED` (l.945) |
| EPN (4) | EPN | roster | `…EPN DUPONT NEURO HEN` (l.1044) |
| Endosulphan (4) | **Thiodan**/endosulfan | roster | `B-2661 THIODAN … ORAL SUBACUTE RAT I` (l.1530) |
| Herban (3 = Hercules) | **norea**/noruron | roster | `C-2772 NOREA BFC ORAL CHRONIC DOG I` (l.1285) |
| Nicotine (4) | nicotine | roster | `C-8799 NICOTINE BLACK LEAF … DOG` (l.1282) |
| Piperonyl butoxide (4) | PBO synergist | roster | `…PIPERONYL BUTOX … TERATOLOGY RAT I` (l.1410) |
| Pyrethrum (7) | ≈ Pyrethrin | roster | `…PYRETHRIN MGK INHALATION MOUSE` (l.1450) |
| Ronnel (4) | **fenchlorphos** | roster | `RONNEL DOW … TERATOLOGY RAT I` (l.1479) |
| **Toxaphene (7)** | toxaphene | roster | `2330 TOXAPHENE BFC ORAL CHRONIC DOG I` (l.1559); **+ Hercules, l.1563** |
| Heptachlor epoxide (4) | heptachlor epoxide | reviewed-pesticide table | summary table l.540 |
| Parathion (4) | parathion | reviewed-pesticide table | summary table l.606 |

(`(n)` = Frawley's appendix reference: **4** = Lehman, *Summaries of Pesticide Toxicity*, AFDOUS 1965; **7** =
Lehman 1952; **1** = Weil & McCollister 1963; **3** = Hercules unpublished. **None = 26/IBT.**) **[CONFIRMED-primary]**

### 3c. ⭐ The one fully-traced Hercules → IBT → invalid chain
> `2476  TOXAPHENE  HERCULES  REPRODUCTION  RAT  I  NA  NO RESP`  *(EPA OCR line 1563)*

The **only** Hercules-sponsored study in the entire EPA roster: a **toxaphene reproduction-rat study, marked
invalid** ("I"), with no replacement response. It sits at the intersection of **(a)** Frawley's employer,
**(b)** a Hercules flagship product Frawley himself tabulated (Toxaphene, no-effect 25 ppm — cited to Lehman, not
to this study), and **(c)** the multigeneration-reproduction genre Frawley later co-authored with IBT president
Calandra (1963/65/73). This is the lede, not a footnote. **[CONFIRMED-primary]**

## 4. Does the "cited Lehman, not IBT" defense actually sever the IBT link? — **Largely yes (structurally), for these pesticides**
The right objection (raised by the user and the skeptic): *a citation to Lehman does not, on its face, certify a
value as IBT-free, because regulatory compendia can relay registrant-submitted data.* Investigated directly
(`lehman-ibt-provenance` workflow), and **for these pesticides the laundering pathway is structurally foreclosed:**
- **Lehman = FDA's own lab.** Lehman's AFDOUS *Summaries* (ref 4) and Lehman 1952 (ref 7) were the **house output
  of the FDA Division of Pharmacology**, which Lehman ran 1946–55 and **where Frawley himself worked** (publishing
  with Fitzhugh & Nelson). The Division pioneered the 2-yr chronic feeding study and the 100-fold safety factor.
- **Chronology excludes IBT from the substrate.** The "Lehman tables" were serialized in the AFDOUS Quarterly
  Bulletin **1948–1955**; **IBT was founded 1953**, did its first documented pesticide/PCB work ~**1969**, and
  reached registration scale only in the **1970s**. A 1953 start-up cannot have fed the 1948–52 installments.
- **The traceable values are FDA in-house — several Frawley's own.** Toxaphene 25 ppm = Fitzhugh & Nelson 1951;
  **parathion / EPN = Frawley, Hagan & Fitzhugh 1952 + Frawley & Fuyat 1957**; diazinon 0.75 ppm = Williams,
  Fuyat & Fitzhugh 1959; DDT = Fitzhugh & Nelson 1947; aldrin/dieldrin = Fitzhugh/Nelson/Quaife 1964 — published
  in JPET / TAP / J. Agric. Food Chem., **not** IBT reports. (Carbaryl isn't even a Lehman cite — ref 1, Weil &
  McCollister 1963.) *Irony: via "Lehman," Frawley is partly citing his **own** pre-Hercules FDA work.*
- **The IBT studies post-date him.** Every IBT study located on these compounds is dated **1967 or later** (e.g.
  endosulfan: non-IBT Hazleton rat 1959 = the plausible source; IBT dog study 1967) — **after** Lehman 1965 and
  Frawley's cutoff, so they **cannot** be his source.
- **So the IBT contamination in Frawley's table enters through his OWN non-Lehman refs** — ref 3 ("Hercules
  unpublished," 3 compounds) and ref 26 ("IBT unpublished," 4 dyes) — **not** through the Lehman-cited pesticides.

**Residual (the one open hinge): [unknown].** The bound **1965 reprint's per-chemical source notes** were not
inspected; a narrow post-1955 addendum *could* silently relay an early-1960s registrant value. Cannot be excluded
without the physical document — but it can only touch post-1955 entries, and is inferred, not demonstrated.

## 4b. The genuinely tight channel — Hercules ↔ IBT (separate from Lehman)
Do **not** let §4 over-clear the picture: the **Hercules→IBT** relationship is real and close, it just enters via
Frawley's own refs, not Lehman. Frawley co-authored **three reproduction-genre studies with IBT president J.C.
Calandra** (1963/65/73); his 1965 rosin paper states verbatim that Hercules used IBT; and in EPA's roster the
**"BFC" sponsor code carries Hercules's agrochemical line** (Antor, Delnav, **Norea/Herban**, Torak — plus the
Hercules-sponsored **toxaphene #2476**) all showing the ~74% IBT invalidity pattern. *(BFC↔Hercules identity is
inferred from the product line — confirm.)* This is the live COI vein; it is just **not** "laundering through Lehman."

## 5. Verdict for open-question A6
- **The naive "smoking gun" is refuted:** Frawley's *explicit* IBT reliance is **4 colour-additive entries**,
  disjoint by construction from EPA's pesticide audit. The fallback worry — that his Lehman-cited pesticides are
  secretly IBT — is **structurally foreclosed** (§4): Lehman = FDA's own pre-1955 in-house data, the named values
  trace to FDA studies (several Frawley's own), and the IBT studies on those compounds post-date him (1967+).
  Anyone claiming "his de minimis dataset is built on the IBT studies EPA threw out" is **overstating** the record.
  **[established]**
- **But it is NOT a clean bill of health:** (i) the 4 IBT dye studies are themselves unaudited (FDA, not EPA,
  would have reviewed them); (ii) the **Hercules↔IBT** channel is tight and documented (Calandra co-authorships;
  the EPA-invalidated **Hercules toxaphene** study; the "BFC"/Hercules agrochemical cluster) — it just enters via
  Frawley's **own** ref-3/ref-26, not via Lehman; (iii) one [unknown] hinge remains: the 1965 Lehman reprint's
  per-chemical notes. Honest status of A6: **substantially resolved & reframed** — the Lehman-laundering hypothesis
  is closed bar one narrow check; the dye/Hercules COI vein stays open. **[established + one inference]**

## 6. What would close the provenance question
1. **THE decisive document — obtain the physical bound reprint *A.J. Lehman, "Summaries of Pesticide Toxicity,"
   AFDOUS, Kansas, 1965* (Frawley's ref 4)** and read its per-chemical source notes for the 14 cross-listed
   pesticides. It is the *only* artifact that converts the §4 [unknown] residual into a closed answer: FDA/literature
   citations → laundering hypothesis fully closed; any IBT/Calandra citation → the narrow post-1955 pathway confirmed.
   Held in AFDO archives / large toxicology libraries / FDA historical holdings. (Fallback: the original 1951–55
   AFDOUS Quarterly Bulletin pesticide installments, which cover the pre-IBT window directly.)
2. Cross-check the **IBT criminal record (*United States v. Keplinger et al.*, N.D. Ill. 1983)** and the full EPA
   IBT master study list for any study **authored by or contracted through J.P. Frawley / Hercules** beyond the
   toxaphene-2476 entry.
3. Confirm whether the 4 **D&C dye** IBT studies were ever caught in **FDA's** parallel IBT colour-additive review
   (EPA's OPP report explicitly excludes them).

## 7. A second, independent integrity lens — how Frawley's "no-effect levels" aged against modern toxicology
The IBT analysis above is about **data provenance** (who generated the numbers). A separate question is whether
the numbers were even **right in hindsight** — and for a class of compounds the answer exposes a deeper, *structural*
flaw in his method, independent of IBT. *(Every ppm value below was cross-checked against Frawley's 1967 Appendix
in `papers/f1967.txt`; all match. His own text confirms the acrylamide framing: "the only compound in the 'all
other compounds' category which was toxic below 100 ppm was acrylamide." Modern classifications are being
source-checked — CAS + IARC monograph volume/year + current regulatory status — in the `frawley-noel-modern-status`
verification pass; a CAS/IARC-cited version of the table will follow.)*

Drawing on sourced modern classifications, here is the precise contrast in the two buckets: chemicals **more toxic
than his number implied**, and the more damaging subset — chemicals now treated as having **no safe threshold at
all** (genotoxic carcinogens), for which his entire "no-effect level" bookkeeping is a category error.

**A note on discipline:** three chemicals that a careless version of this argument would include actually *cut
against* it and are deliberately excluded — **saccharin** (10,000 ppm; NTP **delisted** 2000, IARC Group 3),
**ethyl acrylate** (100 ppm; NTP listed then **delisted** 2000), and **methyl methacrylate** (100 ppm; still IARC
Group 3, not classifiable). Including them as "gotchas" would be dishonest; the table is stronger without them.

### Chemicals Frawley rated safe (or as a lone exception) that proved more hazardous

| Chemical | Frawley 1967 "no-effect" level | His framing | Modern status | Mechanism he couldn't see | Does a "no-effect level" still apply? |
|---|---|---|---|---|---|
| **Vinyl chloride** (via VC–vinyl acetate copolymer) | **120,000 ppm** | Essentially inert; his single highest "safe" value | IARC **Group 1** confirmed human carcinogen (liver angiosarcoma); OSHA cut limit 500→1 ppm in 1975; FDA moved against PVC liquor bottles 1973 | Genotoxic; the bulk polymer is inert but residual **reactive monomer** migrates | **No** — genotoxic, treated as no-threshold |
| **Acrylamide** | **40 ppm** | He flagged it as *the* exception in his "all other compounds" group and moved on | IARC **Group 2A**; neurotoxic, reproductive/developmental toxicant; forms in cooked food (2002) | Genotoxic via glycidamide metabolite; also a route (food-formation) outside his frame | **No** — genotoxic, treated as no-threshold |
| **Di(2-ethylhexyl) phthalate (DEHP)** | **1300 ppm** | Low-toxicity plasticizer — exactly his packaging context | IARC **Group 2B**; EU Repr. 1B; REACH SVHC; banned >0.1% in children's articles (US/EU) | Anti-androgen; endocrine, **low-dose** and developmental-window effects | Disputed — threshold-type but at far lower, life-stage-specific doses |
| **Citrus Red No. 2** | **500 ppm** | Listed as a safe colorant | IARC **Group 2B** bladder carcinogen; FAO/WHO said it should not color food; FDA moving to revoke (2025) | Carcinogenic with genotoxicity signals | Largely **no** |
| **Yellow AB** & **Yellow OB** | **500 ppm each** | Safe oil-soluble colorants | **Delisted** by FDA as unsafe (aminoazobenzene dyes) | Aminoazo carcinogens (genotoxic class) | **No** |
| **Ponceau SX** (FD&C Red No. 4) | **50,000 ppm** | Among his highest "safe" colorant values | **Delisted** in the US as carcinogen/toxicant | Azo dye toxicity/carcinogenicity | Largely **no** |
| **Ponceau 3R** | **5000 ppm** | Safe colorant | **Delisted** as carcinogen | Azo dye carcinogenicity | Largely **no** |
| **BHA** (butylated hydroxyanisole) | **5000 ppm** | Safe antioxidant | IARC **Group 2B**; NTP "reasonably anticipated to be a human carcinogen"; CA Prop 65 | Forestomach tumors — **human relevance contested** (humans lack a forestomach) | Possibly — non-genotoxic, threshold-type |
| **Sodium cyclamate** | **10,000 ppm** | Safe sweetener | **Banned in the US in 1969**, two years after his talk, over bladder tumors | Bladder carcinogenesis — mechanism later contested | Contested |

### The deeper point — "toxic at any ppm" breaks his foundational unit
The first rows — **vinyl chloride, acrylamide**, plus the **azo/aminoazo dyes** — are not merely "more toxic than
1300 or 40 ppm." They are the cases where the *foundational unit of Frawley's table breaks*. His entire method was
to record a "no-effect level" for each compound; under the modern linear-no-threshold treatment of genotoxic
carcinogens, **no such level exists** — every nonzero dose carries some modeled risk. So for these chemicals
Frawley didn't just write down a number that was too high; he wrote down a *kind of number the chemical does not
possess*. That is the qualitative refutation, and it lands hardest on his strongest-looking entry: the 120,000 ppm
vinyl chloride copolymer, the very compound he treated as most unimpeachably safe. *(This dovetails with §4: the
integrity of the 0.1-ppm/0.2% thesis is not only about which cells are IBT-sourced, but about whether the
"no-effect level" abstraction is valid for the compounds in the table at all.)*

### The pesticide "benchmark" category failed too
He used DDT (**1 ppm**), dieldrin (**0.5 ppm**), aldrin (**<0.5 ppm**), heptachlor epoxide (**0.5 ppm**) and
chlordane (**2.5 ppm**) as his examples of *the toxic ones* — his yardstick. Even there he underestimated: all were
later banned as persistent, bioaccumulative endocrine disruptors (DDT elevated to IARC **2A** in 2015), on
persistence and endocrine grounds his feeding-study NOELs never measured. The failure wasn't confined to the
chemicals he called safe; it reached the ones he used to define "toxic."

### 7.1 Sourced reference table (CAS + IARC monograph volume/year) — verified
*(Modern classifications source-checked in the `frawley-noel-modern-status` pass: one researcher per chemical
against IARC Monographs, NTP RoC, FDA/EPA/EU; time-sensitive reg actions independently verified.)*

*The last two columns — **"Known since"** (the year the danger was first authoritatively recognized or acted on)
and **"Source"** (a public online resource) — are mirrored into the de minimis essay's §V table (`reckoningscience/
de_minimis/de_minimis.md`). "Known since" is the year of the linked event: a first human-carcinogen recognition,
an IARC classification, or a regulatory ban/delisting — not necessarily the IARC monograph year in the column
beside it (e.g. vinyl chloride: recognized 1974, IARC re-evaluated Vol 100F 2012).*

| Chemical | CAS | IARC group | IARC monograph (vol, year) | Genotoxic / no-threshold? | Known since | Source |
|---|---|---|---|---|---|---|
| Vinyl chloride (monomer) | 75-01-4 | **Group 1** | Vol 100F (2012) | **Yes — genotoxic, no threshold** | 1974 (human carcinogen recognized) | [CDC MMWR](https://www.cdc.gov/mmwr/pdf/wk/mm4605.pdf) |
| Acrylamide | 79-06-1 | **2A** | Vol 60 (1994) | **Yes — genotoxic, no threshold** | 1994 (IARC 2A; food-formation 2002) | [IARC vol 60](https://www.inchem.org/documents/iarc/vol60/m60-11.html) |
| DEHP | 117-81-7 | 2B | Vol 101 (2013) | No — threshold-type (anti-androgen) | 2008 (CPSIA children's-article ban) | [CPSC](https://www.cpsc.gov/FAQ/Phthalates) |
| Citrus Red No. 2 | 6358-53-8 | 2B | Vol 8 (1975) | Contested (animal bladder/lung tumours) | 1975 (IARC 2B) | [IARC vol 8](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2024960/) |
| Yellow AB (FD&C Yellow 3) | 85-84-7 | **Group 3** | Vol 8 (1975) | No (IARC *not classifiable*) — *FDA-delisted 1959* | 1959 (FDA-delisted) | [FDA color history](https://www.fda.gov/industry/color-additives/color-additives-history) |
| Yellow OB (FD&C Yellow 4) | 131-79-3 | **Group 3** | Vol 8 (1975) | No (*not classifiable*) — *FDA-delisted 1959* | 1959 (FDA-delisted) | [FDA color history](https://www.fda.gov/industry/color-additives/color-additives-history) |
| Ponceau SX = FD&C Red No. 4 | 4548-53-2 | **Group 3** | Vol 8 (1975) | No (*not classifiable*) — *US-delisted (toxicity)* | 1976 (US food delisting) | [FDA color history](https://www.fda.gov/industry/color-additives/color-additives-history) |
| Ponceau 3R | 3564-09-8 | 2B | Vol 8 (1975) | Contested | 1960 (FDA-delisted; was FD&C Red No. 1) | [FDA color history](https://www.fda.gov/industry/color-additives/color-additives-history) |
| BHA | 25013-16-5 | 2B | Vol 40 (1986) | No — threshold (rodent forestomach; human relevance contested) | 1986 (IARC 2B; NTP RoC 1991) | [IARC vol 40](https://www.inchem.org/documents/iarc/vol40/butylatedhydroxyanisole.html) |
| Sodium cyclamate | 139-05-9 | **Group 3** | Vol 73 (1999) | No (*not classifiable*) — *US ban Oct 1969* | 1969 (US ban, Delaney) | [NLM/PubMed](https://pubmed.ncbi.nlm.nih.gov/4186603/) |
| DDT | 50-29-3 | **2A** | Vol 113 (2018; eval 2015) | No — weak/negative genotoxicity (persistence/promotion) | 1972 (EPA cancellation) | [EPA](https://www.epa.gov/ingredients-used-pesticide-products/ddt-brief-history-and-status) |
| Dieldrin | 60-57-1 | **2A** | Vol 117 (2019) | No — threshold-type | 1974 (EPA; all uses 1987) | [EPA](https://www.epa.gov/sites/default/files/2016-09/documents/dieldrin.pdf) |
| Aldrin | 309-00-2 | **2A** | Vol 117 (2019) | No — threshold-type | 1974 (EPA; all uses 1987) | [EPA](https://www.epa.gov/sites/default/files/2016-09/documents/aldrin.pdf) |
| Heptachlor (epoxide 1024-57-3) | 76-44-8 | 2B | Vol 79 (2001) | Contested | 1974 (most uses; 1988 final) | [EPA](https://www.epa.gov/sites/default/files/2016-09/documents/heptachlor.pdf) |
| Chlordane | 57-74-9 | 2B | Vol 79 (2001) | Contested | 1988 (EPA cancellation) | [EPA](https://www.epa.gov/sites/default/files/2016-09/documents/chlordane.pdf) |

### 7.2 ⚠ Corrections the sourcing forced (keep the argument honest)
Three rows in the §7 table above need **softening**, and saying so makes the case *stronger*, not weaker:
- **Yellow AB, Yellow OB, and Ponceau SX (FD&C Red No. 4) are IARC Group 3 ("not classifiable")**, not confirmed
  genotoxic carcinogens. They were **FDA-delisted as unsafe** (Yellow AB/OB in **1959**; FD&C Red 4 later, on
  dog bladder/adrenal toxicity) — which *still* supports "Frawley's 500–50,000 ppm 'safe' value → later removed,"
  but on **regulatory-delisting / toxicity** grounds, *not* IARC carcinogenicity. (Also: Ponceau SX / FD&C Red 4,
  CI 14700, must not be confused with Ponceau 4R / E124, CI 16255 — a different dye.)
- **Sodium cyclamate is IARC Group 3** too; its US removal (Oct 1969 GRAS revocation → 1970 ban) is real but the
  carcinogenesis mechanism was later contested — the original table already flagged this as "contested."
- **DDT** is IARC **2A** but on **weak/negative** genotoxicity — its hazard is persistence/bioaccumulation/tumour-
  promotion, exactly the §7 "benchmark" framing; it is *not* a clean genotoxic-no-threshold case.

**Net effect:** the §7 "category-error / no-threshold" argument lands **cleanest on vinyl chloride (Group 1) and
acrylamide (2A)** — both confirmed genotoxic, no-threshold — supported by the 2B dyes **Citrus Red No. 2** and
**Ponceau 3R**. It should **not** lean on the Group-3 dyes or cyclamate for the *no-threshold* claim (those are
"more toxic / delisted," not "no safe level exists"). Anchoring on VC + acrylamide is unimpeachable. Confirmed
**as-drafted:** vinyl chloride, acrylamide, DEHP (2B), Citrus Red 2 (2B; **FDA synthetic-dye phase-out announced
22 Apr 2025**), BHA (2B), Ponceau 3R (2B); and the reg-history claims (FDA PVC-bottle action **1973**; OSHA VC PEL
**50→1 ppm, 1974**; cyclamate **1969**).

### 7.3 The "ratio" rendering (Frawley's implied safe level → modern limit), most-arresting first
**Unit caveat (so it can't be attacked):** these cross matrices — dietary **ppm** vs occupational **air ppm** vs
food-contact **migration limit** vs outright **ban** — so the ratios show the *direction and magnitude of the
reversal*, not like-for-like doses.
1. **Vinyl chloride — effectively ∞.** 120,000 ppm "safe" in copolymer → OSHA air PEL **1 ppm**; EPA drinking-water
   **MCLG = 0** (no safe level). His single highest "safe" value collides with a no-threshold carcinogen.
2. **Sodium cyclamate — → 0.** 10,000 ppm → **banned** in US food (1969).
3. **Yellow AB / Yellow OB / Ponceau SX — → 0.** 500 / 500 / 50,000 ppm → **delisted** (no longer permitted).
4. **Acrylamide — → no tolerance.** 40 ppm → no safe intake set; EU manages by benchmark µg/kg + margin-of-exposure.
5. **DEHP — ~13×+ and falling.** 1,300 ppm → banned **>0.1% (1,000 ppm)** in children's articles; food-contact
   migration SMLs are far lower still.
6. **Citrus Red No. 2 — restricted to orange-peel only; US phase-out 2025.** 500 ppm → near-zero permitted use.
The cases that produce "∞ / →0" ratios (VC, cyclamate, delisted dyes, acrylamide) are exactly the ones where a
"no-effect level" is the wrong *kind* of number — tying §7.3 back to the category-error point.

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*Method: IBT PDF rendered at 300 dpi → tesseract OCR (46 pp.); Frawley appendix superscripts read at 400 dpi.
Findings verified by a 4-agent adversarial workflow (`ibt-frawley-overlap-verify`): independent superscript
re-read returned the identical 4 ref-26 dyes; all 9 chemistry mappings confirmed (Co-Ral=coumaphos,
Herban=norea/Hercules, Thiodan=endosulfan, Strobane=terpene polychlorinates, Kelthane=dicofol, Ronnel=fenchlorphos
web-verified); EPA scope confirmed pesticide-only with the 4 dyes absent and exactly one Hercules study; the
skeptic supplied the §4 provenance-laundering caveat and the "lead with toxaphene" reframing.*